Rejas and Security Alarms advice

I live in the UK and have had several break-ins at my property on the Costa Del Sol over the years.

I'm looking to have rejas and possibly an alarm fitted and have a few questions. 

Should the rejas be cemented into the walls or will strong security bolts be ok? The companies I talk to seem to use bolts.

Are the small alarms that bolt onto the rejas any good? They sound when someone tries to rip off the rejas.

Can I buy a wireless Yale alarm in the UK and fit it myself in Spain? They seem to be the same system in Spain but half the price in the UK.

Many thanks. I would appreciate any guidance.

I would cement in the Rejas.  I have however even seen them break in through simply smashing a hole in the wall after trying the rejas.

You can fit any alarm system you want but they can be tempermental with the extreme heat if the place is left locked up. The cheaper units can be set off by spiders and flies. The more expensive units have daul tech sensors and are more reliable.

It all comes down to how many people you have around you that will hear and actually do anything about the alarm sounding particulary if it goes off falsely and disturbs them.  I  do however still think they are worth having but may be worth looking at a monitered alarm if you dont have a good network of people close to the property. If you do then any good alarm should be great.

 Recent crimes I hear about being committed (reputed as being largley eastern european gangs) even where alarms were triggered dont seem to worry them to much as they know in some locations the police can take 20 / 30 minutes to respond.

Im not an alarm engineer but have fitted quite a few in the UK and europe both pre and post burglary

Unless the rejas are extremely strong, most are flimsy, they can be car jacked apart, or forced out of the walls.    

As for fixings, as the walls are generally are of the ceramic brick type the only way to make them reasonably secure would be by putting bolts though the walls, with very large metal plates on the inside. But even then if they wanna get it in,  they will.

Thanks for the replies. 

Do you have any experience/ opinion on the sirens that attach to the rejas and sound if they are tampered with?

For me wireless alarms are not the way to go, they cost more for the same quality components as wired alarms and are more prone to false alarms due to battery problems/drain with the sensors, as has been said alarms are only any good if someone will respond, if you have neighbours that live close to you and would not mind if you had an activation at 3am going and having a look then audible only should be ok but the best systems are monitored 24/7 and most security company’s will for a small extra monthly fee add security guard protection, i/e if it goes off they will go there straight away and be in contact with the police, again this is better if the company is local but anything is better than giving people all the time they need to take what they want.